We look at the division of 639720 by 16 
We want to figure out the number of times 639720 can be divided by 16.

Advancing to step 1:
When dividing 6 by 16, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 16

Advancing to step 2:
63 divided by 16 is 3 with a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 48 from 63 leaves us with 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 16

Moving on to step 3:
16 goes into 159 9 times with a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 39.0
If we take 144 away from 159, we end up with 15.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 16

Going ahead to step 4:
157 divided by 16 is 9 with a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 399.0
If we take 144 away from 157, we end up with 13.
Fetch the next digit (2) from the dividend, attach it to 13 and continue: 132 / 16

Moving on to step 5:
When dividing 132 by 16, we get 8 with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 3998.0
Subtracting 128 from 132 leaves us with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 16

Moving on to step 6:
40 divided by 16 is 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 39982.0
If we take 32 away from 40, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
If we divide 80 by 16, we get 5 and a remainder of 0.
The next digit of our result is 5. 
Result so far: 39982.5
Subtract 80 from 80 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
16 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 39982.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
The number 16 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 39982.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 39982.5 and a remainder of 0.0.